Streamside ThermometersStone Creek Streamside Thermometers Two Options: Black or Green Streamside Thermometers are a great tool for fly anglers who are looking to improve their catch rate. Trout are more catchable when temperatures are right and they are stressed if the water is too hot. The thermometer is easy to read and can be used to help predict hatches, spawning times, and feeding periods. Ideal water temperatures for trout, which can help anglers to choose the right